General Statistics of Cities: 1916

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The table is intended to relate to lighting equipment as of the end of the fiscal
year of the city, including equipment ... under the heading aquot;Incandescentaquot;
comprise both the vacuum and nitrogen gas filled types, including mazda, other
tungsten, other ... This variation arises largely because of differences in the
candlepower of the lamps, the number of hours per year ... underground electric
distribution systems, between lighting furnished by the city and by public- service
corporations, andanbsp;...